by 800 is the max you can obtain in any skill and it is properly capped in GUI in 1.05. This does not mean that your gear doesn't count towards it, but it means that if you have +100 taunt skill on your equipment you can spend 700 skill points and still obtain the maximum amount of taunt. You can thus apply the 100 points you "save" on other skills instead.
We are looking into improving how physical invulnerability mitigation from buffs and stances are displayed in the GUI.
Edit: Clarification to this: 800 was always the cap, but we made it more intuitive to understand this cap by hard-capping it in the skill GUI.
So even in pre 1.05 it's capped, just not shown. Time to think about where to put skill points
